Over the years, Brennan's literal view of the world has caused friction with her colleague Booth's emotive attitude, resulting in a volatile relationship, but their sizzling chemistry eventually reached boiling point, and viewers discovered at the end of series six that Brennan was pregnant with Booth's child.

"I can't wait to see the baby. She is like the perfect mum. She will be such a good mum to this baby," John predicted.

The 26-year-old, who plays Dr Lance Sweets - a psychologist who was assigned to the couple after Booth arrested her father - said the pregnancy will take their complex relationship to a different level.

"The fact that Booth and Brennan have a baby together will play a lot into the story, as there's a whole new dynamic between the two of them," he explained.

Just like the show's avid fans, Sweets is intrigued by their complex relationship.

"Sweets will be constantly trying to figure what is going on between them because it's not completely clear yet," he added.